<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0185-1101</journal-id>
<journal-title><![CDATA[Revista mexicana de astronomía y astrofísica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. astron. astrofis]]></abbrev-journal-title>
<issn>0185-1101</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Astronomía]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0185-11012015000100004</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Radio emission variability and proper motions of WR 112]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yam]]></surname>
<given-names><![CDATA[J. O.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dzib]]></surname>
<given-names><![CDATA[S. A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[L. F.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Gómez]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Quintana Roo Departamento de Ciencias ]]></institution>
<addr-line><![CDATA[Chetumal Quintana Roo]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Max-Planck-Institut für Radioastronomie  ]]></institution>
<addr-line><![CDATA[Bonn ]]></addr-line>
<country>Germany</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Radioastronomía y Astrofísica ]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>México</country>
</aff>
<aff id="A04">
<institution><![CDATA[,King Abdulaziz University Faculty of Science Astronomy Department]]></institution>
<addr-line><![CDATA[Yeda ]]></addr-line>
<country>Arabia Saudita</country>
</aff>
<aff id="A05">
<institution><![CDATA[,Harvard-Smithsonian Center for Astrophysics  ]]></institution>
<addr-line><![CDATA[Cambridge Massachusetts]]></addr-line>
<country>Estados Unidos de América</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2015</year>
</pub-date>
<volume>51</volume>
<numero>1</numero>
<fpage>33</fpage>
<lpage>38</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012015000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012015000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012015000100004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Analizamos 64 observaciones en radio a la frecuencia de 8.4 GHz de la estrella Wolf-Rayet WR 112, tomadas de los archivos del Very Large Array. Las observaciones cubren una línea de base temporal de 13 años, de junio del 2000 a julio de 2013. La estructura de WR 112 es consistente con ser una luente puntual en todas las épocas y su densidad de flujo varía entre 0.6 mJy y 2.1 mJy. Intentamos buscar periodicidades en estas variaciones sin éxito. También buscamos emisión extendida asociada con la nebulosa infrarroja que rodea a WR 112, y encontramos límites superiores de 50 µJy. Finalmente, usamos las observaciones con resolución más alta para medir los movimientos propios de WR 112, y obtenemos µ&#945;cos &#948; = -2.6 ± 1.1 mas yr-1, y µ&#948; = -5.4 ± 1.4 mas yr-1. Estos movimientos propios son menores que los reportados previamente, pero continúan sugiriendo movimientos peculiares significativos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[We analyzed 64 radio observations at the frequency of 8.4 GHz of the Wolf-Rayet star WR 112, taken from the Very Large Array archive. These observations cover a time baseline of 13 years, from June 2000 to July 2013. The radio structure of WR 112 is consistent with it being a point source in all the epochs and with its flux density varying from 0.6 mJy to 2.1 mJy. We tried to search for periodicities in these variations but our results were not conclusive. We also looked for extended emission from the infrared nebula that surrounds WR 112, settimg upper limits of 50 µJy. Finally, we used the highest angular resolution images to measure the proper motions of WR 112, obtaining µ&#945; cos &#948; = -2.6 ±1.1 mas yr-1, and µ&#948; = -5.4 ± 1.4 mas yr-1. These proper motions are smaller than those previously reported, but still suggest significant peculiar motions for WR 112.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[astrometry]]></kwd>
<kwd lng="en"><![CDATA[circumstellar matter]]></kwd>
<kwd lng="en"><![CDATA[stars]]></kwd>
<kwd lng="en"><![CDATA[stars]]></kwd>
<kwd lng="en"><![CDATA[stars]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="center"><font face="verdana" size="4"><b>Radio emission variability and proper motions of WR 112</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>J. O. Yam<sup>1</sup>, S. A. Dzib<sup>2</sup>, L. F. Rodr&iacute;guez<sup>3,4</sup> and V. Rodr&iacute;guez&#45;G&oacute;mez<sup>5</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>1</i></sup> <i>Departamento de Ciencias, Universidad de Quintana Roo, Boulevard Bah&iacute;a S/N, C. P. 77019, Chetumal, Quintana Roo, Mexico</i> (<a href="mailto:oyam@uqroo.edu.mx">oyam@uqroo.edu.mx</a>).</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>2</i></sup> <i>Max&#45;Planck&#45;Institut f&uuml;r Radioastronomie, Auf dem H&uuml;gel 69, 53121 Bonn, Germany</i> (<a href="mailto:sdzib@mpifrbonn.mpg.de">sdzib@mpifrbonn.mpg.de</a>).</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>3</i></sup> <i>Centro de Radioastronom&iacute;a y Astrof&iacute;sica, IJNAM, Universidad Nacional Aut&oacute;noma de Mexico, Apartado Postal 3&#45;72, 58090 Morelia, Michoacan, Mexico.</i></font> <font face="verdana" size="2">(<a href="mailto:l.rodriguez@crya.unam.mx">l.rodriguez@crya.unam.mx</a>)</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>4</i></sup> <i>Astronomy Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia</i>.</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>5</i></sup> <i>Harvard&#45;Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA.</i></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Received July 15 2014.    <br> 	Accepted October 13 2014.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>RESUMEN</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Analizamos 64 observaciones en radio a la frecuencia de 8.4 GHz de la estrella Wolf&#45;Rayet WR 112, tomadas de los archivos del <i>Very Large Array</i>. Las observaciones cubren una l&iacute;nea de base temporal de 13 a&ntilde;os, de junio del 2000 a julio de 2013. La estructura de WR 112 es consistente con ser una luente puntual en todas las &eacute;pocas y su densidad de flujo var&iacute;a entre 0.6 mJy y 2.1 mJy. Intentamos buscar periodicidades en estas variaciones sin &eacute;xito. Tambi&eacute;n buscamos emisi&oacute;n extendida asociada con la nebulosa infrarroja que rodea a WR 112, y encontramos l&iacute;mites superiores de 50 <i>&#181;</i>Jy. Finalmente, usamos las observaciones con resoluci&oacute;n m&aacute;s alta para medir los movimientos propios de WR 112, y obtenemos <i>&#181;</i><sub>&#945;</sub>cos <i>&#948;</i> = &#151;2.6 &plusmn; 1.1 mas yr<sup>&#45;1</sup>, y <i>&#181;</i><sub>&#948;</sub> = &#151;5.4 &plusmn; 1.4 mas yr<sup>&#45;1</sup>. Estos movimientos propios son menores que los reportados previamente, pero contin&uacute;an sugiriendo movimientos peculiares significativos.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>ABSTRACT</b></font></p>  	    <p align="justify"><font face="verdana" size="2">We analyzed 64 radio observations at the frequency of 8.4 GHz of the Wolf&#45;Rayet star WR 112, taken from the <i>Very Large Array</i> archive. These observations cover a time baseline of 13 years, from June 2000 to July 2013. The radio structure of WR 112 is consistent with it being a point source in all the epochs and with its flux density varying from 0.6 mJy to 2.1 mJy. We tried to search for periodicities in these variations but our results were not conclusive. We also looked for extended emission from the infrared nebula that surrounds WR 112, settimg upper limits of 50 <i>&#181;</i>Jy. Finally, we used the highest angular resolution images to measure the proper motions of WR 112, obtaining <i>&#181;</i><sub>&#945;</sub> cos <i>&#948;</i> = &#151;2.6 &plusmn;1.1 mas yr<sup>&#45;1</sup>, and <i>&#181;</i><sub>&#948;</sub> = &#151;5.4 &plusmn; 1.4 mas yr<sup>&#45;1</sup>. These proper motions are smaller than those previously reported, but still suggest significant peculiar motions for WR 112.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key Words:</b> astrometry &#151; circumstellar matter &#151; stars: individual: (WR 112) &#151; stars: Wolf&#45;Rayet.</font></p>  	    ]]></body>
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